/* ==========================================================================
   layout.css — header, footer, page shell
   ========================================================================== */

/* --- Site header ------------------------------------------------------ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 18px var(--col-pad);
  background: color-mix(in oklab, var(--c-bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-med) var(--ease),
              background var(--t-med) var(--ease),
              padding var(--t-med) var(--ease);
}

.site-header[data-scrolled="true"] {
  border-bottom-color: var(--c-line);
  padding-top: 12px;
  padding-bottom: 12px;
}

.site-header__meta {
  font-family: var(--font-base);
  font-size: var(--fs-overline);
  font-weight: var(--fw-medium);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.55;
}

.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-base);
  font-size: 22px;
  letter-spacing: -0.02em;
  font-weight: var(--fw-black);
}

.site-header__brand .dot {
  width: 6px;
  height: 6px;
  border-radius: 100%;
  background: var(--c-accent);
  transform: translateY(-3px);
  display: inline-block;
}

.site-header__nav {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-header__nav a {
  font-size: 14px;
  font-weight: var(--fw-medium);
  letter-spacing: -0.005em;
  position: relative;
  padding-bottom: 2px;
}

.site-header__nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--c-ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-fast) var(--ease);
}

.site-header__nav a:hover::after,
.site-header__nav a:focus-visible::after { transform: scaleX(1); }

.site-header__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--c-ink);
  border-radius: 999px;
  font-size: 13px;
  font-weight: var(--fw-semibold);
  letter-spacing: -0.005em;
  background: var(--c-ink);
  color: var(--c-bg);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.site-header__cta:hover { background: var(--c-accent); border-color: var(--c-accent); }

@media (max-width: 1080px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header__meta { display: none; }
  .site-header__nav { gap: 18px; }
  .site-header__nav a:not(.site-header__cta) { display: none; }
}

/* --- Page shell ------------------------------------------------------- */
.page {
  padding-top: 84px;
}

/* --- Site footer ------------------------------------------------------ */
.site-footer {
  margin-top: var(--sp-8);
  border-top: 1px solid var(--c-ink);
  background: var(--c-bg);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: var(--sp-5);
  padding: 64px var(--col-pad) 32px;
  max-width: var(--col-max);
  margin: 0 auto;
}

.site-footer__brandblock h3 {
  font-family: var(--font-base);
  font-size: clamp(48px, 5.4vw, 72px);
  font-weight: var(--fw-black);
  letter-spacing: -0.045em;
  line-height: 0.95;
}

.site-footer__brandblock p {
  margin-top: 18px;
  font-size: 14px;
  font-weight: var(--fw-light);
  letter-spacing: -0.01em;
  line-height: 1.7;
  opacity: 0.7;
  max-width: 32ch;
}

.site-footer__col h4 {
  font-family: var(--font-base);
  font-size: var(--fs-overline);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 18px;
  font-weight: var(--fw-bold);
}

.site-footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.site-footer__col a {
  font-size: 15px;
  font-weight: var(--fw-regular);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.site-footer__col a:hover { color: var(--c-accent); }

.site-footer__bottom {
  border-top: var(--rule);
  padding: 20px var(--col-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-base);
  font-size: var(--fs-overline);
  font-weight: var(--fw-medium);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.55;
  max-width: var(--col-max);
  margin: 0 auto;
}

@media (max-width: 880px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-4);
  }
  .site-footer__brandblock { grid-column: 1 / -1; }
  .site-footer__brandblock h3 { font-size: 44px; }
  .site-footer__bottom { flex-direction: column; gap: 8px; }
}